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Sorry to hear you’re facing problems 
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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 12.0.2): 16.0
Operating system and version (eg, Ubuntu 17.04): Arch Linux
Apache or nginx version (eg, Apache 2.4.25): Nginx
PHP version (eg, 7.1): 7.3.4 + UWSGI
The issue you are facing:
I cant sync my contacts with KAddressbook (Kontact)
Is this the first time you’ve seen this error? (Y/N): yes
Steps to replicate it:
- add a nextcloud/webdav account
- sync
- error
The output of your Nextcloud log in Admin > Logging:
{webdav} {"Exception":"Sabre\\DAV\\Exception\\NotAuthenticated","Message":"No public access to this resource., No 'Authorization: Basic' header found. Either the client didn't send one, or the server is misconfigured, No 'Authorization: Bearer' header found. Either the client didn't send one, or the server is mis-configured, No 'Authorization: Basic' header found. Either the client didn't send one, or the server is misconfigured","Code":0,"Trace":[{"function":"beforeMethod","class":"Sabre\\DAV\\Auth\\Plugin","type":"->","args":[{"absoluteUrl":"https:\/\/cloud.example.de\/remote.php\/dav\/calendars\/99999\/contact_birthdays\/","__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]},{"file":"\/usr\/share\/webapps\/nextcloud\/3rdparty\/sabre\/event\/lib\/EventEmitterTrait.php","line":105,"function":"call_user_func_array","args":[[{"autoRequireLogin":true,"__class__":"Sabre\\DAV\\Auth\\Plugin"},"beforeMethod"],[{"absoluteUrl":"https:\/\/cloud.thaodan.de\/remote.php\/dav\/calendars\/99999\/contact_birthdays\/","__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]]},{"file":"\/usr\/share\/webapps\/nextcloud\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php","line":466,"function":"emit","class":"Sabre\\Event\\EventEmitter","type":"->","args":["beforeMethod",[{"absoluteUrl":"https:\/\/cloud.example.de\/remote.php\/dav\/calendars\/99999\/contact_birthdays\/","__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]]},{"file":"\/usr\/share\/webapps\/nextcloud\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php","line":254,"function":"invokeMethod","class":"Sabre\\DAV\\Server","type":"->","args":[{"absoluteUrl":"https:\/\/cloud.thaodan.de\/remote.php\/dav\/calendars\/99999\/contact_birthdays\/","__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]},{"file":"\/usr\/share\/webapps\/nextcloud\/apps\/dav\/lib\/Server.php","line":316,"function":"exec","class":"Sabre\\DAV\\Server","type":"->","args":[]},{"file":"\/usr\/share\/webapps\/nextcloud\/apps\/dav\/appinfo\/v2\/remote.php","line":35,"function":"exec","class":"OCA\\DAV\\Server","type":"->","args":[]},{"file":"\/usr\/share\/webapps\/nextcloud\/remote.php","line":163,"args":["\/usr\/share\/webapps\/nextcloud\/apps\/dav\/appinfo\/v2\/remote.php"],"function":"require_once"}],"File":"\/usr\/share\/webapps\/nextcloud\/3rdparty\/sabre\/dav\/lib\/DAV\/Auth\/Plugin.php","Line":168,"CustomMessage":"--"}
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'datadirectory' => '/var/lib/nextcloud/data',
'instanceid' => 'ocsk6q936cke',
'appstoreenabled' => false,
'cache_path' => '/var/lib/nextcloud/cache',
'trusted_domains' =>
'dbtype' => 'pgsql',
'version' => '16.0.0.9',
'dbname' => 'nextcloud',
'dbhost' => '/run/postgresql',
'dbport' => '',
'dbtableprefix' => 'oc_',
'installed' => true,
'ldapIgnoreNamingRules' => true,
'ldapProviderFactory' => 'OCA\\User_LDAP\\LDAPProviderFactory',
'log_type' => 'systemd',
'loglevel' => 0,
'maintenance' => false,
'memcache.local' => 'OC\\Memcache\\Redis',
'memcache.locking' => 'OC\\Memcache\\Redis',
'redis' =>
array (
'host' => '/run/redis/redis.sock',
'port' => 0,
),
'updater.release.channel' => 'stable',
'theme' => '',
);
The output of your Apache/nginx/system log in /var/log/____:
e nginx[10289]: 2019/04/28 03:16:43 [error] 10291#10291: *1638 readv() failed (104: Connection reset by peer) while reading upstream, client: 84.175.160.117, server: cloud.thaodan.de, request: "REPORT /remote.php/dav/addressbooks/users/99999/kontakte/ HTTP/1.1", upstream: "uwsgi://unix:///run/nextcloud.sock:", host: "cloud.example.de"
Apr 28 03:16:43 thaodan.de uwsgi[18582]: [pid: 18586|app: -1|req: -1/37507] 84.175.160.117 () {54 vars in 940 bytes} [Sun Apr 28 03:16:43 2019] REPORT /remote.php/dav/addressbooks/users/99999/kontakte/ => generated 557 bytes in 31 msecs (HTTP/1.1 401) 12 headers in 875 bytes (1 switches on core 0)
nginx config:
server {
listen 443 ssl http2;
listen [::]:443 ssl;
server_name cloud.thaodan.de;
ssl_certificate /etc/letsencrypt/live/cloud.example/fullchain.pem; # managed by Certbot
ssl_certificate_key /etc/letsencrypt/live/cloud.example/privkey.pem; # managed by Certbot
root /usr/share/webapps/nextcloud;
client_max_body_size 1G;
add_header Strict-Transport-Security max-age=15768000;
add_header X-Robots-Tag "none";
add_header X-Content-Type-Options "nosniff";
add_header X-XSS-Protection "1; mode=block";
add_header X-Download-Options noopen;
add_header X-Permitted-Cross-Domain-Policies "none";
add_header X-Frame-Options "SAMEORIGIN";
add_header 'Referrer-Policy' 'strict-origin';
underscores_in_headers on;
keepalive_timeout 105;
keepalive_requests 356;
reset_timedout_connection on;
client_body_buffer_size 10M;
#client_max_body_size 10M;
rewrite ^/.well-known/carddav $scheme://$host/remote.php/dav/ permanent;
rewrite ^/.well-known/caldav $scheme://$host/remote.php/dav/ permanent;
# The following 2 rules are only needed with webfinger
rewrite ^/.well-known/host-meta /public.php?service=host-meta last;
rewrite ^/.well-known/host-meta.json /public.php?service=host-meta-json last;
location ~ ^/(build|tests|config|lib|3rdparty|templates|data)/ {
deny all;
}
location ~ ^/(?:\.|autotest|occ|issue|indie|db_|console) {
deny all;
}
# location ~ \.(?:css|js|woff2?|svg|gif)$ {
#
#try_files $uri $uri/ /index.php;
#}
location ~ ^(?!\/remote\.php)(?:.*)\.(?:css|js|woff2?|svg|gif)$ {
try_files $uri $uri/ /index.php;
add_header Cache-Control "public, max-age=15778463";
# Add headers to serve security related headers (It is intended to
# have those duplicated to the ones above)
# Before enabling Strict-Transport-Security headers please read into
# this topic first.
add_header Strict-Transport-Security "max-age=15768000; includeSubDomains; preload;";
#
# WARNING: Only add the preload option once you read about
# the consequences in https://hstspreload.org/. This option
# will add the domain to a hardcoded list that is shipped
# in all major browsers and getting removed from this list
# could take several months.
add_header X-Content-Type-Options nosniff;
add_header X-XSS-Protection "1; mode=block";
add_header X-Robots-Tag none;
add_header X-Download-Options noopen;
add_header X-Permitted-Cross-Domain-Policies none;
add_header Referrer-Policy no-referrer;
# Optional: Don't log access to assets
#access_log off;
}
ignore_invalid_headers off;
location ~ \.php(?:$|/) {
include uwsgi_params;
uwsgi_modifier1 14;
# Avoid duplicate headers confusing OC checks
uwsgi_hide_header X-Frame-Options;
uwsgi_hide_header X-XSS-Protection;
uwsgi_hide_header X-Content-Type-Options;
uwsgi_hide_header X-Robots-Tag;
#uwsgi_param Authorization $http_authorization;
uwsgi_pass_header HTTP_AUTHORIZATION;
uwsgi_pass_header Authorization;
#uwsgi_pass_request_headers on;
uwsgi_pass unix:///run/nextcloud.sock;
}
location = /data/htaccesstest.txt {
deny all;
log_not_found off;
access_log off;
}
error_page 403 /core/templates/403.php;
error_page 404 /core/templates/404.php;
index index.php;
location / {
try_files $uri $uri/ /index.php;
}
}
uwsgi config:
[uwsgi]
; default for local testing run it like "uwsgi --ini nextcloud.ini"
ini = :nextcloud
http-socket = :8000
http-socket-modifier1 = 14
static-check = %(nextcloud_dir)
static-skip-ext = .php
static-skip-ext = .inc
offload-threads = 2
buffer-size=65535
output_buffering = 65535
harakiri = 240
http-timeout = 240
socket-timeout = 240
worker-reload-mercy = 240
reload-mercy = 240
mule-reload-mercy = 240
[service]
ini = :nextcloud
logger = systemd
die-on-term = yes
# nginx will set security headers
env = modHeadersAvailable=true
[nextcloud]
master = true
processes = 4
nextcloud_dir = /usr/share/webapps/nextcloud
plugins = php
php-docroot = %(nextcloud_dir)
php-index = index.php
php-allowed-ext = /ocs/v1.php
php-allowed-ext = /ocs/v2.php
php-allowed-ext = /index.php
php-allowed-ext = /cron.php
php-allowed-ext = /status.php
php-allowed-ext = /remote.php
php-allowed-ext = /public.php
php-allowed-ext = /core/templates/403.php
php-allowed-ext = /core/templates/404.php
php-allowed-ext = /core/ajax/update.php
php-set = date.timezone=Europe/Berlin
#php-set = open_basedir=
php-set = session.save_path=/tmp
php-set = post_max_size=1000M
php-set = upload_max_filesize=1000M